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. 1983;2(3):353–359. doi: 10.1002/j.1460-2075.1983.tb01430.x

Altered maturation of sequences at the 3' terminus of 5S gene transcripts in a Saccharomyces cerevisiae mutant that lacks a RNA processing endonuclease.

P W Piper 1, J A Bellatin 1, A Lockheart 1
PMCID: PMC555140  PMID: 11894949

Abstract

Sequences at the immediate 3' terminus of several eukaryotic primary transcripts, synthesised just before the termination of transcription, are often lost during RNA processing. The rna82.1 mutation in Saccharomyces cerevisiae appears to result in a deficiency of the endonuclease that removes such sequences from certain yeast transcripts. Some small RNAs of rna82.1 cells are a few nucleotides longer than their counterparts in wild-type S. cerevisiae. The 5S rRNAs made during very short pulse-labellings of the mutant have, relative to the mature 121 nucleotide 5S RNA of wild-type cells, an additional 7, 11 or 13 nucleotides at their 3' terminus. These 5S forms reveal sites upon 5S genes where transcription probably terminates in vivo. The extra nucleotides upon 5S RNAs in rna82.1 cells are lost very slowly by sequential removal from the 3' terminus. Through this 3'-5' exonuclease action the total 5S RNA of the mutant possesses several 3'-terminal sequences yet is mostly only 0-3 nucleotides longer than in wild-type S. cerevisiae. Just one or two of these 3'-terminal sequences serve as a substrate in vivo for a poly(A) polymerase since a small proportion of rna82.1 5S RNAs terminate in the sequence: CAAUCUUU(A)n.

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Selected References

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